I've been using this for a little while. You need to make an account first, which can be the hardest part, google translate is your friend. Once you know it is setup, you scan the QR code at the top select menu. It will then give you a 6 letter code. Enter that code in the machine, and you'll hear a tone indicating it was entered correctly, or not. Play, advance levels, events and missions. When you're done, you select the 3rd option from the menu, it will then generate you a New QR code. You scan that and your progress and missions completed will be recorded into your account. When you're ready to play again, you scan the first top/menu QR code, and it will generate a new 6 letter code. It will place you at the beginning of the last Level you reached, it doesn't give you any progress you've made, and it doesn't have any info on what missions/events you passed. All that data is stored on your online account.

Step 1. Make an account. (Only needs to be done once)
Step 2. Scan QR Code
Step 3. Input 6 letter code, listen for music and message that you inputed it correctly.
Step 4. Play Enjoy!
Step 5. Finished playing? / get a new QR code to scan from 3rd menu option. This records your progress to your account.

Back for more? Do Step 2 thru 5.